Xu, Kui
Shen, Zhexian
Wang, Yurong
Xia, Xiaochen
Funding for this research was provided by:
National Natural Science Foundation of China (61671472)
Jiangsu Province Natural Science Foundation (BK20160079)
Article History
Received: 16 June 2017
Accepted: 30 January 2018
First Online: 12 February 2018
Competing interests
: The authors declare that they have no competing interests.
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